Adhesive applying device



Nov. 10, 1959 F. c. GROSS 2,911,942

ADHESIVE APPLYING DEVICE Filed Feb. 25, 1957 2 Sheets-Sheet 1 INVENTORFHA/VA C. 69055 BY F 7141/ ATTORNEYS 2 Sheets-Sheet 2 ATTORNEYS Nov. 10,1959 F. c. GROSS ADHESIVE APPLYING DEVICE Filed Feb. 25, 1957 UnitedStates Patent ADHESIVE APPLYING DEVICE Frank C. Gross, Wilhraham, Mass.,assignor to Package Machinery Company, East Longmeadow, Mass., acorporation of Massachusetts Application February 25, 1957, Serial No.642,013

24 Claims. (Cl. 118--202) This invention relates to apparatus forapplying adhesive to the surface of sheets or blanks in the manufactureof boxes or other containers and in the sealing of containers and forsimilar or other purposes where the adhesive applying means and thesurface to which the adhesive is to be applied are moved relative toeach other in effecting such application.

This application is a continuation in part of application Serial No.290,545, filed May 28, 1952, now Patent 2,846,930, and of applicationSerial No. 339,593, filed March 2, 1953 and now abandoned.

One object of the invention is to provide adhesive applying meansoperable at high speeds and which applies a predetermined amount ofadhesive to a restricted area.

A further object is to provide means of the above character capable ofhandling quick drying or setting adhesives supplied in liquid form, andcapable of handling with equal facility and advantage thermoplasticadhesives or cements, supplied in semi-solid or solid rope or rod form.

Another object is to provide adhesive applying means of the abovecharacter which will avoid or prevent escape of adhesive and resultingfouling of the adjacent elements of the machines with which the applyingdevice is associated, during operation of such machines or duringtemporary stoppage thereof.

Other and further objects will be made apparent in the disclosures ofthe accompanying drawings and the following specification and claims.

In the accompanying drawings:

Fig. 1 is an elevational view, partly in section, showing two liquidadhesive applying devices embodying the invention in association withthe forming plunger and folding channel of a box or tray formingmachine, the applying devices being shown in side elevation;

Fig. 2 is a front elevational view of one of the applying devices ofFig. 1;

Fig. 3 is a detail view, on a larger scale, showing the relation of theadhesive feed to the applying roll;

Figs. 4 and 5 are detail views showing modified structures;

Fig. 6 is a side elevational view, partly in section, of an adhesiveapplying device embodying the invention as modified for handling athermoplastic adhesive supplied in solid rope or rod form; V

Fig. 7 is a generally top plan view, parts being broken away, looking inthe direction of the arrows 7-7 in Fig. 6;

Fig. 8 is a sectional view, parts being broken away, substantially online 8-8 of Fig. 6; I

Fig. 9 is a detail plan view showing the relation of the adhesive feedto the applying roll;

Fig. 10 is a fragmentary view similar to ing a modified adhesivechamber; and

Fig. 11 is a detail view of the arcuate face of the adhesive supplyingmember.

Referring to Fig. 1, two adhesive applying devices ac- Fig. 6showcording to the invention and generally indicated at 1,

are shown positioned at opposite sides of the folding.- channel C of abox or tray forming machine, which includes a plunger P by which a boxblank B is carried through the channel provided with side and endfolders- F which fold the blank against the sides and ends of theplunger. As the so-folded blank is carried downward into the channel thesides of the blank are engaged by 5 the applying rolls 2 of the devices1 by which a band of adhesive is applied to the sides of the blank. Asthe plunger carried blank is carried downwardly through] channel tabs Textending from the ends of the end Wall of the blank and shown in dottedline in Fig. 2, are

folded onto the adhesively coated portion of the blank by folders F andare pressed into firm engagement therewith by rolls R. The elements ofthe box machine form no part of the present invention and may take anyconventional or desired form and further description thereof aretherefore unnecessary.

The adhesive applying devices 1 are identical in con-. The glue rolls 2are each rotatably mounted struction. between fork arms 3 of a member 4adjustably secured to a bracket 5 by a screw 6 extending through a slot7 l The bracket 5 is mounted on a frame member 8 of the box machine foradjustment. longitudinally. Frame members 8 are mountedadjacenttheirends to a pair of supporting plates 9, one of each- 7 inthe wall of the bracket.

arcuate concentric engagement (Fig. 1) with the peripheral surface ofthe glue roll. As best shown in Fig. 3, the peripheral surface of theadhesive roll is formed with transverse grooves or other suitably shapeddepressions 13. The grooves 13 are preferably slightly longer than thediameter of the glue passage 14 in the head 12 but are shorter than theoutside diameter of the head and of less transverse width than the wallthickness of head 12 so that, as the rolls rotate over the adhesivesupply opening, the grooves 13 are filled with adhesive,

but no adhesive can escape between the engaging surfaces of the head androll. The opposite end of plunger 1 11 extends through and is slidablysupported by a bushing 15 threaded in a wall of bracket 5. A compressionspring 17 surrounding the plunger 11, with its opposite ends engaginghead 12 and bushing 15, urges the head of the plunger into contact withthe glue roll with .a pressure which is controlled by adjusting theposition of bushing 15 in the bracket, the bushing being held inadjusted position by a set screw 18. Plunger 11 is preventedfr omrotation in. bore 10 by a screw 19 which engages in a keyway 20 formedin the plunger head 12.

The free end of plunger 11 is connected by a flexible tube 22 or othersuitable conduit, to a source of adhesive, not shown, from whichadhesive is supplied under gravity pressure to the rolls.

machine, and confines the adhesive supply to the grooves 13. Evaporationand setting of the adhesive is confined to the surface of the rolls."The small body of glue in each of the grooves is sufficient to withstandobjectionable hardening or setting during a momentary stoppage and inthe event of a prolonged stoppage only the surface of the roll requirescleaning with a suitable solvent to prepare the machine for continuedoperation.- The quantity of adhesive applied can be controlled by thedepth and width of the grooves, the length of the Patented Nov. 10,1959I As will be apparent, a closed adhesive system is thus provided whichprevents undesirable escape of adhesive over adjacent parts of thegrooves being held to a dimension such that the ends of the grooves areclosed by the walls of the head 12, as shown in Fig. 3.

As shown in Fig. 1 the applying rolls 2 are rotated by contact with thesurface to which the adhesive is applied as such surface is movedrelative to the roll. If found desirable, and as shown in Fig. 4, theshafts of rolls Z'may be provided with rubber friction rolls 24 whichengage the surface of the blank to one side of the portion engaged bythe roll 2 to provide a friction drive in addition to the frictionaldrive of the applying roll itself. Alternatively the rolls 2 may bepositively driven from any suitable powered shaft of the machine withwhich the device is associated. In Fig. 1, for example, the shafts 27 ofpresser rolls R are shown provided with sprockets 28 driven by chains 29from a sprocket 30 in a powered shaft 31 of the box machine. If desiredthe shafts of rolls 2'may be provided with a sprocket 33, as indicatedin Fig. 5, and rolls 2 positively driven, in common with rolls R, fromthe sprockets 30 on shaft 31 by a chain 34 which replaces chain 29.

In Figs. 7 to 9 a modified form of the invention is shown which is moreparticularly adapted for handling a thermoplastic adhesive supplied in asolid rope or rod form.

Referring to the latter figures, spaced side members 41 and 42 areconnected at their base by a plate 43. In the opposite ends of members41 and 42 is rotatably mounted a shaft 44, carrying the glue applyingroll 45. Shaft 44 is provided, outwardly of the adjacent member 41 witha sprocket 46 by which roll 45 is driven in the direction of the arrowin Fig. l, as later described. Slidably fitted between members 41 and 42is a member 47 provided with a longitudinal bore 48. The forward endportion of member 47 is generally rectangular in cross section, the rearportion 49 comprising a cylindrical extension which extends rearwardlythrough an opening 50 in plate 43. The forward end of member 47 isformed with an arcuate face 51, conforming to the radius of roll 45.Bore 48 opens to the periphery of roll 45 through arcuate face 51, thebore being enlarged and flared adjacent the opening to form a chamber asindicated at 52. A coiled spring 53 surrounds the extension 49 and iscompressed between the rear plate 43 and a shoulder 54, formed at thejunction of extension 49 with member 47, to maintain the arcuate face 51of member 47 in contact with the periphery of roll 45.

A cover member 55 bridges the side members 41 and 42 and is securedthereto as by machine screws 56. The member 47 is yieldingly held indiametrical alignment with the roll 45 by relatively stiff leaf springs57 and 58 respectively secured as by screws 59 to cover 55 and a crossbar 60, formed integral with or otherwise secured between members 41 and42. The forward end of cover 55 is provided with an extending portion 61which extends forwardly part way around the periphery of roll 45, theextending portion 61 being formed with side flanges 62 extending alongthe sides of roll 45 and the edges of which preferably engage the endsof side members 41 and 42 From the leading lip 63 of chamber 52 to theend of extension 61 the inner face of the latter is grooved as at 64 toavoid direct contact with the adhesive carried by the roll. The covermember 55 is provided with parallel bores 65 in each of which ispositioned an electrical heating cartridge 66 of conventional type,supplied with current through suitable leads, not shown.

The extension 49 is provided at its entrance end with a suitable lengthof heat insulating tubing H of thermoset plastic or other suitablematerial to prevent premature softening of the rope adhesive A.

heat insulating material such as hard rubber or a thermo- 4 set plastic.A tubular guide member 70 is secured between the rear end portions ofbrackets 68 and 69 in spaced axial alignment with bore 48. Opposed feedrolls 71 and 72 are mounted between brackets 68 and 69, the respectiveshafts 73 and 74 of rolls 71 and 72 being suitably journaled in thebrackets. The sides of tubular guide 70 are cut away as at 75 to permitfeeding engagement of a rope A of thermoplastic adhesive passing throughguide 70. The transverse form and dimensions of bore 48 conformsubstantially to the corresponding dimensions of rope A. The shaft 74 ofroll 72 is provided outwardly of bracket 68 with a sprocket 76 by whichthe roll 72 is driven, as later described, in the direction of the arrowin Fig. l to frictionally feed the rope of adhesive A through guide 70and into and through bore 48 and into the chamber 52 where it is reducedto a suitable viscosity for application to a box blank, wrapper or otherarticle, indicated in broken lines at B, by the heat supplied by heaters66 in the cover member and transmitted through members 41 and 42 to themember 47 and by the latter to the end portion of the rope A within thechamber 52. The extension 61 which receives its heat from the heatersmaintains the adhesive carried forward by roll 45 suitably fluid untilit is applied to the surface which is to receive it.

The brackets 68 and 69 are shown notched as at 77 to be clamped to theframe F of a box forming machine in any suitable way, as previouslydescribed, at any desirable angle as shown in Fig. 6. Applying roll 45and feed roll 72 are adapted to be driven through their respectivesprockets 46 and 76 from any convenient source of power as by sprocketchains 78 and 79 trained around sprockets 80 and 81 secured to a poweredshaft 82 of the machine to which the device is attached.

It will be understood that the sprockets 46, 76, 80 and 81 are of suchdiameter as to drive the applying and feed rolls, constantly orintermittently, at the desired speed to maintain the proper supply ofadhesive to chamber 52 and roll 55, roll 72 slipping if the pressure onthe adhesive in chamber 52 exceeds that necessary to properly fill therecesses in the roll, later described, and hat the ra ing of the heatersused will be that required to properly plasticize or liquify theparticular thermoplastic compound of which the rope is made to meet thespeed of operation of the machine with which the device is used.

For the purpose of controlling the quantity of adhesive advanced by roll45 and to meet other requirements of certain box forming operations, aswell as to prevent fouling of the machine as above described, thesurface of roll 45 is provided with parallel grooves 83 or otherengraved pattern, the lip 63 acting as a doctor blade to fill thegrooves, and the dimensions of the arcuate surface 51 at the sides andends of the chamber 52 being such as to confine the adhesive carried bythe roll to the grooves 83, and prevent escape of adhesive from thechamber.

The combination above described has the general advantages of thatpreviously described, including the handling of quick setting adhesivesand further permits the use of the rope type thermoplastic adhesivematerials.

A modified arrangement is shown in Fig. 10, where the heating chamber 85in member 47 and opening to the periphery of roll 45 is provided with abafile bar 86 about which the substantially liquified adhesive is forcedbefore being forced into the pockets or grooves 83 in the peripheralsurface of roll 45. Baffle 86 is fixed as by a screw or screws 87 to themember 47 and is heated therefrom. As the liquified adhesive is forcedinto the narrowing space between the face of the roll 45 and theadjacent angular face of the bafile 86 it is positively forced into thepockets 83 of the roll at the exit side of the chamber assuring thateach pocket is completely and properly filled.

Preferably and as shown in Figs. 10 and 11 the arcuate face of member 47is relieved to form a channel 90 of decreasing width and depth from theouter edge of member 47 to a line adjacent the chamber 85, so that anyadhesive retained at the edges of the pockets 83 or on the adjacentunrelieved portions of the surface of roll 45 will not be scraped ordoctored ofi by the outer edge of member 47 but will be carried inwardlybetween the roll and the arcuate face of member 47 and scraped ordoctored back into the pockets by the inclined edges 91 of the channel96 and the transverse edge 92 at the inner end of the channel. Thedecreasing depth of the channel and the unrelieved portion 93 betweenthe inner end of channel 96 and chamber 47 assures that such surplusadhesive is forced into the pockets. The unrelieved portion 93 betweenthe inner end of channel 90 and chamber 47 is of greater transversedimensions than the transverse dimensions of the recesses 83 andprevents any escape of adhesive from chamber 47 into the channel.

The outer end of channel 9% is preferably at least as wide as the lengthof the recesses 83.

The provision of channel 90 prevents or minimizes the formation ofstrings of adhesive at the outer edge of the arcuate face of member 47.

What is claimed is:

1. An adhesive applying device which comprises a support includingspaced side members, an adhesive applying roll rotatably mounted betweensaid members at their forward end, an adhesive supplying memberpositioned between said side members and provided with a longitudinaltubular passage opening at its forward end to the surface of said rolland through which adhesive material may be fed to the roll, a covermember bridging said side members and having a forwardly extendingportion overlying an arcuate portion of the roll beyond the opening ofsaid supply passage to the roll, said extending portion being positionedout of contact with the roll and the adhesive carried thereby andelectric heating means carried by said cover member to maintain theadhesive in the forward end of said passage and on the portion of theroll underlying said extending portion at a temperature to maintain thedesired viscosity.

2. An adhesive applying device which comprises a support includingspaced side members, an adhesive applying roll rotatably mounted betweensaid members at their forward end, an adhesive supplying member slidablymounted between said side members and provided with a longitudinaltubular passage opening at its forward end to the surface of said rolland through which adhesive material may be fed to the roll, portions ofsaid member surrounding said opening engaging the surface of the roll,spring means maintaining contact of said portions with the roll, meansto heat said member, means spaced from the rear end of said passage tofeed thermoplastic adhesive in solid rope form to and through saidpassage, and heat insulating means intermediate said passage and saidfeeding means to confine the heating of the adhesive to that portion ofthe rope within the passage.

3. In an adhesive applying device a rotatable adhesive applying roll,the peripheral surface of the roll being relieved to provide a pluralityof recesses separated from each other and from the peripheral edges ofthe roll by unrelieved portions of said surface, means to advancethermoplastic adhesive in the form of a solid rope endwise into contactwith the peripheral surface of the roll, means to heat the portion ofsaid adhesive in contact with and adjacent the roll to substantiallyliquify said portion and fill said recesses with liquid adhesive, meansto rotate the roll, and means engaging the unrelieved portion of theperipheral surface of the roll entirely around the area of contact ofthe adhesive with the roll to limit the adhesive carried by the roll tosaid recesses.

4. In an adhesive applying device a housing, an adhesive applying rollrotatably mounted in said housing for rotation free of peripheralcontact therewith and having a portion of its peripheral surfaceextending outwardly of the housing, the peripheral surface of the rollbeing relieved to provide a plurality of recesses separated from eachother and the peripheral edges of the roll by unrelieved portions ofsaid surface, means to supply adhesive to the roll comprising a membermounted in the housing and having an arcuate surface engaging andconforming to a portion of the peripheral surface 'of the roll withinthe housing, a passage formed in and extending through said member, oneend of the passage opening through said arcuate surface and the otherend opening outwardly of the housing, means to rotate the roll, means tofeed thermoplastic adhesive in solid rope form through said passage,means to heat said member to substantially liquify that portion of theadhesive within the passage and adjacent the roll to fill said recessesand to heat said housing to maintain the adhesive in the recesses in asubstantially liquid condition as the latter is carried outwardly of thehousing upon rotation of the roll.

5. In an adhesive applying device a housing, an adhesive applying rollrotatably mounted in said housing for rotation free of peripheralcontact therewith and having a portion of its peripheral surfaceextending outwardly of the housing, the peripheral surface of the rollbeing relieved to provide a plurality of recesses separated from eachother and the peripheral edges of the roll by unrelieved portions ofsaid surface, means to supply adhesive to the roll comprising a memberslidably mounted in the housing and having an arcuate surface engagingand conforming to a peripheral portion of the roll within the housing, aspring maintaining said arcuate surface in contact with the roll, saidarcuate surface being recessed to form a chamber open to the pe ripheralsurface of the roll, a passage formed in and extending through saidmember one end of said passage opening to said chamber and the other endopening outwardly of the housing, means positioned outwardly of thehousing to feed thermoplastic adhesive material in the form of a solidrope, conforming in cross-section to the cross-section of the passage,into and through said passage to said chamber, heating means to liquifythat portion of the adhesive that is within the chamber to fill therecesses in the roll, and means to drive said feeding means and roll intimed relation to each other.

6. In an adhesive applying device a housing, an adhesive applying rollrotatably mounted in said housing for rotation free of peripheralcontact therewith and having a portion of its peripheral surfaceextending outwardly of the housing, the peripheral surface of the rollbeing relieved to provide a plurality of recesses separated from eachother and the peripheral edges of the roll by unrelieved portions ofsaid surface, means to supply adhesive to the roll comprising anadhesive supplying member slidably mounted in the housing and having anarcuate surface engaging and conforming to a peripheral portion of theroll within the housing, said arcuate surface being recessed to form achamber, a passage formed in and extending through said member forsupplying adhesive to said chamber and the peripheral portion of theroll exposed therein, and means yieldingly urging said member againstthe roll.

7. In an adhesive applying device a support, an adhesive applying rollrotatably mounted on the support, the peripheral surface of the rollbeing relieved to provide a plurality of recesses separated from eachother and from the peripheral edges of the roll by unrelieved portionsof said surface, an adhesive supplying member slidably mounted on thesupport and having an arcuate surface engaging and conforming to aperipheral portion of the roll, a passage formed in and extendingthrough said member and opening through said arcuate surface forsupplying adhesive to the peripheral surface of the roll and meansyieldingly urging the portion of said arcuate surface surrounding saidpassage against the unrelieved portions of the peripheral surface of theroll to confine the adhesive supplied to the roll to the said recessesin the peripheral surface thereof.

8. An adhesive applying device which comprises a support, an adhesiveapplying roll, means for supplying adhesive to the adhesive applyingroll comprising a tubular plunger one end of which, throughout itsperimeter, is in arcuate concentric engagement with the periphery of theroll, spring means pressing said tubular plunger toward the roll andinto sealing engagement therewith and means to supply adhesive underpressure to and through said tubular plunger.

9. An adhesive applying device which comprises a support, an adhesiveapplying roll, the peripheral surface of the adhesive applying rollbeing provided with a plurality of circumferentially spaced recesses ofless transverse extent than the transverse dimension of the peripheralsurface of the roll, the means for supplying adhesive to the rollcomprising a tubular plunger making arcuate concentric engagement withthe periphery of the roll, the transverse extent of said engagementbeing sufficient to confine the adhesive, supplied through the tubularplunger, to said recesses, spring means pressing said tubular plungerinto substantially fluid-tight engagement with the roll outwardly ofsaid recesses, and means to supply adhesive under pressure to saidtubular plunger.

10. An adhesive applying unit for die and plunger carton formingmachines which comprises, a bracket adapted to be mounted at a side ofthe path of the plunger of the machine, a roll rotatably mounted in saidbracket, a tubular plunger slidably mounted in said bracket, one end ofsaid plunger making an arcuate concentric contact with the periphery ofsaid roll, spring means pressing said plunger into contact with theroll, means to supply adhesive to the interior of the tubular plunger,and a presser roll rotatably mounted in said bracket and spaced from andin alignment with said adhesive applying roll.

11. An adhesive applying unit for die and plunger carton formingmachines which comprises, a. bracket adapted to be mounted at a side ofthe path of the plunger of the machine, a roll rotatably mounted in saidbracket, the peripheral surface of said roll being provided with aplurality of recesses of less transverse extent than the transversedimension of the peripheral surface of the roll, a tubular plungerslidably mounted in the bracket, one end of said plunger making anarcuate concentric engagement with the periphery of the roll, thetransverse extent of said engagement being sufficient to confine theadhesive, supplied through the tubular plunger, to said recesses, springmeans pressing said tubular plunger into contact with the roll, means tosupply adhesive to the interior of the tubular plunger, and a presserroll rotatably mounted in said bracket and spaced from and in alignmentwith said adhesive applying roll.

12. An adhesive applying unit as in claim 11 having electrical heatingmeans carried by the bracket to maintain the adhesive in the end of thetubular plunger at a temperature to maintain the desired viscosity.

13. An adhesive applying device comprising a support, an adhesiveapplying roll rotatably mounted on the support, the peripheral surfaceof the roll being relieved to provide a plurality of recesses separatedfrom each other and from the peripheral edges of the roll by unrelievedportions of said surface, an adhesive supplying member slidably mountedon the support and having an arcuate surface engaging and conforming toa peripheral portion of the roll, a passage extending through saidmember for supplying adhesive to the peripheral portion of the rollexposed therein, means yieldingly urging the portion of said arcuatesurface surrounding said passage against the unrelieved portions of theperipheral surface of the roll and means to rotate the roll, the saidportions of said arcuate surface being of sufficient extent to preventescape of adhesive between the engaging unrelieved surfaces of the rolland said member and confine the adhesive carried by the roll to saidrecesses in the peripheral surface thereof.

14. An adhesive applying device as in claim 13 and having a transversebaffle extending transversely of said passage adjacent the roll, theface of said baffle adjacent the roll being inclined to provide anarrowing passage between the opposed faces of the baffle and roll inthe direction of rotation of the roll.

15. An adhesive applying roll as in claim 13 the portion of said arcuatesurface at the incoming side of the roll being relieved to form achannel extending inwardly from the outer edge thereof, and terminatingshort of said passage a distance greater than the transverse width ofthe recesses in the surface of the roll, said channel decreasing inwidth and depth from its outer end.

16. An adhesive applying roll as in claim 13 having electrical heatingmeans carried by the support to maintain the adhesive in the forward endof said passage at a temperature to maintain the desired viscosity.

17. An adhesive applying roll as in claim 16 the portion of said arcuatesurface at the incoming side of the roll being relieved to form achannel extending inwardly from the outer edge thereof, and terminatingshort of said passage a distance greater than the transverse width ofthe recesses in the surface of the roll, said channel dc creasing inwidth and depth from its outer end.

18. An adhesive applying roll as in claim 14 the portion of said arcuatesurface at the incoming side of the roll being relieved to form achannel extending inwardly from the outer edge thereof, and terminatingshort of said passage a distance greater than the transverse width ofthe recesses in the surface of the roll, said channel decreasing inwidth and depth from its outer end.

19. An adhesive applying roll as in claim 14 having electrical heatingmeans carried by the support to maintain the adhesive in the forward endof said passage at a temperature to maintain the desired viscosity.

20. An adhesive applying roll as in claim 19 the portion of said arcuatesurface at the incoming side of the roll being relieved to form achannel extending inwardly from the outer edge thereof, and terminatingshort of said passage a distance greater than the transverse width ofthe recesses in the surface of the roll, said channel decreasing inwidth and depth from its outer end.

21. An adhesive applying device comprising a housing, an adhesiveapplying roll rotatably mounted in said housing for rotation free ofperipheral contact therewith and having a portion of its peripheralsurface extending outwardly of the housing, the peripheral surface ofthe roll being relieved to provide a plurality of recesses separatedfrom each other and the peripheral edges of the roll by unrelievedportions of said surface, means to supply adhesive to the rollcomprising a member mounted in the housing and having an arcuate surfaceengaging and conforming to a portion of the peripheral surface of theroll within the housing, a passage extending through said member, oneend of the passage opening through said arcuate surface, meansyieldingly urging that portion of said arcuate surface surrounding saidpassage and the opposed unrelieved portions of the peripheral surface ofthe roll into engagement with each other, the said portions of saidarcuate surface being of sufficient extent to prevent escape of adhesivebetween the engaging unrelieved surfaces of the roll and said member,means to rotate the roll, means to feed thermoplastic ad-' hesive insolid rope form through said passage, and means to heat said member tosubstantially liquify that portion of the adhesive within the passageand adjacent the roll to fill said recesses and to heat said housing tomaintain the adhesive in the recesses in a substantially liquidcondition as the latter is carried outwardly of the housing uponrotation of the roll.

22. An adhesive applying device as in claim 21 and having a transversebaflle extending transversely of said passage adjacent the roll, theface of said baflle adjacent the roll being inclined to provide anarrowing passage between the opposed faces of the baffle and roll inthe direction of rotation of the roll.

23. An adhesive applying device as in claim 21, the portion of the saidarcuate surface at the incoming side of the roll being relieved to forma channel extending inwardly from the outer edge thereof, andterminating short of said passage a distance greater than the transversewidth of the recesses in the surface of the roll, said channeldecreasing in Width and depth from its outer to its inner end.

24. An adhesive applying device as in claim 23 and having a transversebafile extending transversely of said passage adjacent the roll, theface of said baifie adjacent the roll being inclined to provide anarrowing passage between the opposed faces of the baifie and roll inthe direction of rotation of the roll.

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